贡嘎山东坡土壤有机质及氮素分布特征
收稿日期: 2004-02-18
修回日期: 2004-06-15
网络出版日期: 2004-11-25
基金资助
国家自然科学基金重点项目 (40331006)
Distribution Characteristics of Soil Organic Matter and Nitrogen on the Eastern Slope of Mt. Gongga
Received date: 2004-02-18
Revised date: 2004-06-15
Online published: 2004-11-25
Supported by
Key Project of National Natural Science Foundation of China, No.40331006
对贡嘎山东坡自然垂直带土壤有机质和氮素的分布特征的研究表明，贡嘎山东坡表层土壤有机质和全氮含量随海拔升高有上升趋势，但在针阔混交林以上出现波动，在群落过渡带处出现显著峰值，气候和植被类型的综合作用决定了有机质和氮素的空间分布。土壤有机质和氮素在土壤剖面中的垂直分布趋势一致，凋落物层和土壤A层高于B、C层，这与动植物残体在土壤中的垂直分布格局类似。群落过渡带在腐殖质A层出现氮素累积峰。土壤碳氮比介于7~25之间，相对较低，利于土壤腐殖质化和有机氮矿化。碳氮比随海拔升高而升高，在土壤剖面中的分布随植被类型不同而有所差异。土壤中的氮素主要以有机氮的形式存在于土壤有机质中，土壤碳氮比与有机质含量显著相关。
王琳,欧阳华,周才平,张锋,白军红,彭奎 . 贡嘎山东坡土壤有机质及氮素分布特征[J]. 地理学报, 2004 , 59(6) : 1012 -1019 . DOI: 10.11821/xb200406025
The distribution of soil organic matter (SOM) and nitrogen of Gongga Mountain were studied in this paper. The results showed that the contents of SOM and N of A horizon had an ascending trend with the increase of the elevation. The vegetation types distributed higher than the mixed broad-leaved conifer forest had the irregular trends. In the transitional communities such as mixed forest and treeline, the contents of SOM and N were higher than other vegetation types. The distribution of SOM and N of A horizon was determined by the mutual effect of climate and vegetation types. The vertical distribution of SOM and N in soil profile had the similar trends in all kinds of vegetation types, i.e., the content of A horizon was higher than that of the B and C horizons, which was the same to the distribution of dead animals and plants in soil. There were N accumulation peaks in A horizon of the transitional communities. The soil C:N is between 7 and 25, which is lower relative to the appropriate C:N of 25-30. The soil C:N increased with the increase of the elevation, but its vertical distribution in the soil profile varied with different vegetation types. The N in the SOM existed mainly in the form of organic nitrogen, and the soil C:N was significantly correlated with SOM.
Key words： Mt. Gongga; vertical gradient; soil organic matter; nitrogen
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